Tests by our team and also confirmed by Premier Support, tenancy without CA/MAM policies – no issue with any version of the Office Apps opening shared files.

The only workarounds until the issue was fixed was to either

• Launch OneDrive for Business Mobile App, navigate to Shared Tab and launch the shared file
• Enable notifications in the Office Apps and when a filed was shared, the respective Office App will show notification in iOS for the user to be able to launch the shared file

Since then couple of iterations of public updates partially resolved the issues – links in Outlook Mobile App opened as expected. However links in the native mail app in iOS would launch the Office App but show error that can’t open file.

Excel file in this instance showed the following

Beknown to all, with latest update version 3.14 of the Office Apps, the links open from native mail in iOS.

This version of Office Apps got a special mention in this blog post (not about the bug resolved but new features)